Valve-grinding device.



B. P. REHFELD.

VALVE GRINDING DEVICE.

APPLICATION FILED JAN.24, 1914.

Patented Nov. 24, 1914.

Wibvmoow entree snares earner onrroa.

BENJAMIN F. REHFELD, OF CRESBARD, SOUTH DAKOTA.

VALVE-GRINDING DEVICE.

ueeoa.

To all 'whom it may concern:

'Be it known that I, BENJAIVIIN F. Berirnnu, a citizen of the United States, residing at Cresbard, in the county of Faulk and State of South Dakota, have invented new and useful Improvements in Valve-Grinding Devices, of which the following is a specification.

An object of the invention is to provide a structure or mechanism for use in grinding valves, and which is particularly adaptable in connection with internal combustion engines so that the valve can at all tunes properly engage the seat thereof.

The invention contemplates, among other features, the provision of means for 1mparting rotation to the valve whereby the valve when engagin the seat, due to its rotation, will be kept 0 can, smooth and dry so that the valve can properly seat upon the valve seat, the rotation of the valve being accomplished through the medium of suitable mechanism operable by a shaft of the motor of which the valve forms a part.

In the further disclosure of the invention reference is to be had to the accompanying drawing, constituting a part of this specificatiomin which similar characters of reference denote corresponding parts in all the views, and in which:

Figure 1 is a fragmentary side elevation of an internal combustion engine, showing my invention; Fig. 2 is a front elevation; Flg. 3 is a horizontal sectional view taken on the line 33 in Fig. 1; and Fig. 4 is a fragmentary enlarged elevation of the valve and means for rotating the same, parts being shown in section.

Referring more particularly to the views I disclose an internal combustion engine 10 and which consists of the usual cylinders 11, a crank shaft 12, a cam shaft 13 capable of rotation through the medium of suitable toothed wheels 14 and 15 intermcsl'iing and carried on the crank and cam shafts, respectively, the said toothed wheels 14 and 1.5 being preferably arranged in a suitable housing 16. The crank shaft 1.2 operates the usual pistons of the cylinders 11 and the cam shaft 13 is adapted to actuate suitable valves 17 carried on valve stems 18 adapted to normally repose upon valve seats 19. It will be understood that an internal combustion engine of the type shown and which is of the four-cylinder type, should, of course,

' have a plurality of valves 17 for each cylin Specification of Letters Patent.

Patented Nov. 2 1, 1914i.

Application filed January 24, 1914. Serial No. 814.190.

der. In order to carry out the invention a horizontal shaft 20 is journaled on the cylinders 11 and carries suitable worms 21 keyed to the shaft and rotatable therewith. Mounted to turn on one end of the shaft 20 is a toothed wheel 22, over which passes a chain 23 having connection with a toothed wheel 24 carried on the cam shaft 13. A clutch 25 consists of a member 26 adapted for gripping engagement with a member 27 carried by the toothed wheel 22, the said member 26 being keyed to rotate with the shaft 20 and slidable longitudinally thereon so that it can be moved into or out of engagement with the member 27. The memer 26 can be advanced or retreated on the shaft 20 through the "l'lltdlllm of a suitable lever 28 mounted to swing on a suitable bracket 29 and said lever preferably has connected thereto a rod 30 which, when the internal combustion engine described is used on an automobile or other vehicle, extends to a point adjacent the dash-board so that the operator, by actuating the rod 30, can throw the clutch 25 into or out of operative position, as will be readily understood.

Mounted to slide on each valve stem 18 is a toothed wheel 31 of a width substantially equal to the length of the stroke of the valve stem, said toothed wheel 31 being keyed to rotate with the stem and carried adjacent to the particular valve 17 of the stem, and which valve is adapted for engagement with the valve seat 19, as mentioned heretofore. A toothed wheel 31 meshes with each of the worms 21 on the shaft 20, and thus it will be seen that when the clutch 25 is thrown into position and rotation is imparted to the shaft 20, the rotation of the worms will result in the retation of the toothed wheel 31, thus imparting rotation to the valve stems and the valves carried thereby. Therefore, the valve will be constantly subjected to a 1'0- tating movement and upon engaging the particular seats thereof will have the surfaces kept in a smooth condition and subjected to a grinding action relatively to the seats so that the valve will at all times fit snugly on the seats. lly actuating the rod 30 the clutch can be thrown out of operative position, thus breaking the connection between the shafts 13 and 20 and resulting in a discontinuance of the rotation of the shaft 20. It will be apparent that the structure described can be used with all kinds and forms of engines or other inn-- chines which have valves Whose relation to the valve seats must be an accurate one and. whereby the valves will snugly fit upon. the valve seats in order that the greatest efficiency can be secured.

It wiil be UilLiG'l'Si'U-Ud. that the rotation of each valve stem and the consequent rotution. of each i'zih'c thcrcofcun i either of a constant or periodic 1m turn, 11, miding en tii'ely upon the pni'ticuim; construction and form of worm used. to rotate the toothed Wheel meshing with the worm and carried on the valve stem.

Having thus described my claim:

1. In coinhinzitimi with an, engine having a l'evoiubie sim'ft, '21, wire inning a stem.

invention,' 1

provided. with gem), i shaft jinn-exiled. on the engine zine nm'nmiij; held iilOiiKvl'iltiVG thereon and provided 'w' 5h a worm gear en-- gaging the gear on the 'mive stem, means connectii'ig the i'evolubie shaft with the sec ond mentioned shaft for rotating the latter, and means carried by the second mentioned Felonies of this patent "he obteineei ior five mieeoe shaft for disengaging the driving means, whereby to render the second mentioned shaft inoperative.

Q. In combination with an ei'igine having a i'evoiuble shaft, [L valve carried by the engine and having a stem, a shaft joui'naied on the engine and. noi'nmliy held inoperative thereonv means connecting the second mentioned shaft with the valve stem for imparting rotation. to the stem when the second nieniiii'uicd shaft operated, ineiins c nnecting the rcvoiubie shaft with the second men'- Licncii zahziizhiiori' ting theiattet' for disconnect "he m kin me:

the second lllQlliJl nod t .01 ieiuier i'ig J the latter inoperative and inchiolii ,cn lutch :inces carried i'es 'iectiieiy by h-ii'ing means and th second mentioned 1. It:

in testin'iony whereof, I afiix my signature in 1;)1'csence of two Witnesses.

BEN Ali MN F. REHFELD.

i i i tnesses iii U. MUCOMB, A. E. JEWELL.

each, by addressing the Commissioner of Patents,

Washington, 13. C. 

